Shutter is a feature rich open source application for capturing screenshots. Shutter will let you capture a selection, full desktop, window, menus and even whole webpages. It even has a built in editor for annotating captured screens with freehand lines, highlights, lines, arrows, boxes, elipses, text and more. It is as close to SnagIt as I have seen for an open source project – it even has built in plugins for image manipulation.
Installing Shutter on Ubuntu 10.4 (Lucid Lynx) is very straight-forward. Click Applications, then Accessories and then Terminal.
Next add a PPA (Personal Package Archive) for Shutter to your repositories with the following command:
sudo add-apt-repository ppa:shutter/ppa
Then update your apt-get sources so that your system knows about the Shutter PPA that we just added:
sudo apt-get update
Finally install Shutter:
sudo apt-get install shutter
Click Applications, Accessories and then Shutter to run the application.
For further information visit: http://shutter-project.org/